Which type of firework propels multiple effects into the air from a single tube?

The correct answer is Roman candle. A Roman candle is a traditional type of firework that is designed to shoot multiple aerial effects from a single tube. As the candle burns, it ignites successive charges located within the tube, producing a series of colorful bursts or effects at various intervals. This characteristic of launching multiple effects over time distinguishes Roman candles from other types of fireworks.

Mortars, while they are also used to launch aerial shells, generally release one shell at a time rather than multiple effects simultaneously from a single setup. Comets and mines are different types of fireworks with unique operational mechanisms and visual effects, where comets typically refer to single-shot effects and mines are designed to create a wider effect from a ground-based device or explosive charge, not necessarily multiple bursts from one tube. Thus, the Roman candle stands out for its specific function of delivering a sequence of aerial effects from one containment structure.